PF is just power failure so your breaker or electricity went out. Go check your breaker usually it's on a 50a 2 pull breaker and sometimes 1 of the breakers gets stuck. Click them hard back and forth till you know they both are clicked in the on position. Never heard of an ER code unless it means error code on your unit. Check your keypad connection at the main board behind the keypad, clean all contacts and make sure all connections are good and clean and free of debris. I've seen this happen before and the oven was controlled by the main control and the elements were affected by the relay board in the rear of the unit near where the plug comes in the board number is 316442112. Check to make sure you have power going to that board and out of it follow the wire colors from that board to your switch boards underneath the touchpad make sure you have all good connections and that your wires aren't burnt and ohm out correctly. Good luck

To HRM. Thanks. Loose wire or bad contact under key pad. Glenmar